Yes It does how much h.p. is gained depends on the type of system you get.
It is possible to dissassamble exhaust pipes and remove the silencer pipe from inside the exhaust proper. This will, however, make the bike more noisy and thus illegal in many countries. Another way would be to buy other than stock, that is aftermarket exhaust pipes and mount them on the bike.
"The Best" is a matter of personal preference, but I'm very happy with the performance of Cobra Slash-cut pipes on my '07 VLX. I found the factory exhaust to be a factor in the VLX's inherent vibration tendencies, something that was lessened by the switch to the aftermarket exhaust. Keep in mind that such aftermarket pipes do make the bike louder. This is not a real complaint amongst enthusiasts, but state and local laws can come into play when altering the bike's exhaust.
how to quiet a exhaust on a pocket bike without buying a new exhaust?
As of August, 2014, the Kawasaki's 2012 ZX-14R is the bike that is known to have the most horsepower. This bike is considered a high torque motorcycle.
The length, and depending on horsepower, it could be larger for the higher horsepower bike.
Suzuki rates this bike at 127 horsepower
This bike has about 18 horsepower
the power band is a characteristic of an engine, the way it delivers horsepower through the rpm range. you cannot buy powerbands for your bike. you can buy aftermarket parts that will change the power band that your engine has now.
A slip on exhaust will give a dirt bike more power. A full exhaust setup will give you even more power than a slip on.
I have a 2005 CBR600 F4i With a K&N Air filter also a M4 Exhaust Slipon and had been tuned at Las Vegas Dyno Tech. With all these items on the bike the Rear Wheel Horsepower came out at 97 RWHP
It could be condensation from hot exhaust gases on the cool exhaust pipe.
If the bike is in good condition and nothing wrong with tuning or maintenance, then there are still some things you can do to increase its performance. You can change the standard exhaust system for a customized one that fits with the current exhaust fasteners. This will increase power somewhat but also the engine noise. The second thing you can do is to install a customized air cleaner that eases the air flow into the carburetors. You can get both things at various bike shops that cater to customized motorcycles.